Home / 1,191.17-1,786.75-421.13

Finding the Fourth Proportional to 1,191.17, 1,786.75 and 421.13

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Solution

The fourth proportional to 1,191.17, 1,786.75 and 421.13 is: 631.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.17 : 1,786.75 = 421.13 : x
  2. Step 2: Convert to fraction form
    1,191.17/1,786.75 = 421.13/x
  3. Step 3: Cross multiply
    1,191.17x = 1,786.75 × 421.13
  4. Step 4: Simplify right side
    1,191.17x = 752,444.04
  5. Step 5: Solve for x
    x = 752,444.04/1,191.17
  6. Step 6: Final answer
    x = 631.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.